Quatech INTERBUS S manual Technical Data

Technical Data:

Item Number 750-

Number of inputs

Voltage supply

Sensor types

Cold junction compensation

Measuring accuracy

Resolution

Isolation DC/DC

Input current (internal)

Bit width per channel

Configuration

Operating temperature

Connection technique

Dimensions (mm)WxHxL

Presetting

462, 469

2 (differential input, max. +/- 3.5V)

via system voltage

J, K, B, E, N, R, S, T, U, L, mV Messung

on each module

<25 µV, typ. 15 µV

0.1°C per Bit

500V system / power supply

65 mA max.

16 Bit: data; 8 Bit: control/status* (detection of broken wire 750-469)

none, optional via software parameter

0°C....+55°C

CAGE CLAMP; 0.08 to 2.5mm2

12 x 64* x 100 (*from upper edge of the carrier rail)

-100°C / +1370°C, Typ K

The function module 750-462 permits the direct connection of thermocouple sensors. The module is suitable for 2 or 3-wire thermocouples. For the 2-wire connection technique, connect the thermocouple wires between TC- and TC+ . For the 3-conductor technique the shield is also connected. The operation of grounded sensors is provided by means of internal electrical isolation.

The function module 750-469 alos detects a broken wire. You can find the PNs for the different sensor types for 750-462 in the following table.

Warning: Both inputs are referenced to a common potential (not isolated)!

The linearization is provided over the complete range by a microprocessor. The temperature ranges of the sensors are represented with a resolution of 1 bit per 0.1°C in one word (16 Bit). Thus, 0°C corresponds to the value 0000, and 25.5°C correspond to the value 0 x 00FF. Temperatures below 0°C are represented in two’s complement with a leading ‘1’.

Within the whole range of all thermocouples, the function module works like a ‘μV meter’. The voltage resolution is represented with 16 bits. A processor converts the voltage value into a numerical value proportional to the measured temperature of the selected type of thermocouple.

In order to compensate the offset voltage at the clamping point, a cold junction thermocouple compensation calculation is carried out. The circuit contains a temperature measuring sensor at the ‘CAGE CLAMP’ connection and considers the temperature offset voltage when calculating the measured value.

Input￿￿￿￿￿￿￿￿for thermocouple modules 750-462,469 2

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